The news broke on giantbomb.com that the 2D dual joystick sequel has a 3D camera mode that can be unlocked by hitting the right bumper and pressing the back button at the same time. Below is a screenshot from GiantBomb showcasing the new mode.

I also found footage of the 3D mode on YouTube which you can see below.

It appears as if you wont actually be able to play the game while in this mode and is merely just a camera trick that allows you to see the action up close.